Machine tool



Oct. 9, 1934. E, v d 1,975,912

MACHINE TOOL Filed Jan. 6, 1950 gwmznto'c J 50 1/? .0 M/Y6/A Patented Oct. 9, 1934 UNITED. STAT :MACHINE troop/ Y I 7 Edgar D Vancil, Cincinnati, Ohio, as'signor to l The Cincinnati Milling Machine Company, Cin- This invention relates to milling machines and more particularly to an improved means for lubricating the outboard end of a cutter arbor.

" One of the objects of this invention is to provide a pendant having an oil reservoir self contained therein.

Another object of this invention is to provide automatic lubricating means for the outboard end of a cutter arbor.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawing 15 illustrative of one embodiment thereof, but it will be understood that any modifications may be made in the specific structural details hereinafter disclosed, within the scope of the appended claims, without departing from or exceeding the at spirit of the invention.

In the drawing, in which like reference numerals indicate like parts:

Figure 1 is an elevation of the machine, showing one embodiment of the invention therein; Figure 2 is a section on the line 22 of Figure 1;

Figure 3 is a section on the line 33 of Figure 2; and

Figure 4 is a detail view of the lubricating ggwick.

Referring to the drawing, and more especially to Figure 1, the reference numeral indicates the column of a conventional milling machine having the overarm 11, said overarm having ad- 5 justably mounted on the end thereof the pendant 12.

The pendant 12 has the flexible portion 13, in which is threaded the end of the bolt 14.- slidably mounted in the solid portion 15 of the pendant 12 for clamping the pendant to the overarm. In the upper portion of the pendant 12 is the oil reservoir 16 having the inlet 17, through which oil is poured to fill the reservoir. The inlet 17 is closed by the cap 18. In an opening in one 4 face of the pendant there is inserted a glass 19 held in place by the ring 20 having the bolts 21 circumferentially spaced thereabout and threaded into the pendant 12. The glass serves as visible means for ascertaining the amount of oil 0 in the reservoir.

The pendant 12 is providedwith a tapered bore 22 for receiving the fixed bushing 33 which has the lubricant channel 34 formed therein. A bearing sleeve 35 is mounted on the end of the Y cutter arbor 24 and journaled in the bushing 33.

1A piece of hollowtubing 25 is mounted in the oil reservoir vertically'over the channel 34' andhas one end inserted in the bore 26 which communicates withthe channel 34. A piece of felt or other wick material is inserted in the lower end of the tube 25 between a pin 28 fixed in the tube and a hollow plug 30 threaded in the end of the tube. The tube 25 has a plurality of holes I29 circumferentially spaced thereabout to permit oil from the reservoir 16 to pass therethrough and saturate the felt, whereby the oil will gradually drip into the channel 34 to lubricate the bearing sleeve 35.

Since the reservoir 16 is a closed chamber, the oil would not readily flow therefrom, on account of creating a vacuum in the chamber. In order to overcome this difficulty, the tube 25, it will be noted, extends through the ceiling of the reservoir and is open at its upper end to the atmosphere, thus permitting atmospheric pres- 7 5 sure to gradually seep through the wick 27 and holes 29 into the reservoir and overcoming any impediment to the ready flow of oil from the chamber.

This construction is also advantageous for another reason. When the pendants are removed from the overarm,"to permit changes of set-up in the machine for instance, it is common practice to place the pendants on a bench or other support in an upside down position from that shown in Figure 2 because the faces 36 of the pendants form the most convenient means of support. When the pendants are in this upside down position. it will be noted that even although the open end of the tube is at the bottom, no oil is lost from the reservoir because the openings 29 have then emerged from the oil, thus preventing any leakage of oil when the pendants are not in use.

The lower end of the pendant is threaded to receive the bolt 31 by means of which, braces 32, mounted on the knee of the machine, are clamped to the pendant to steady the same.

'What is claimed is:

1. A pendant for a milling machine having a lubricant chamber formed in the upper part of the pendant, a bearing formed in the pendant beneath said chamber, a tube mounted in the chamber and extending through the opposite walls thereof, one end of said tube communicatmg with the bearing and the other end of said tube communicating with the atmosphere, apertures formed in the tube adjacent the floor of said reservoir to permit the flow of oil from said reservoir to said bearing when in normal posino tion and to prevent the flow of oil when in an inverted position.

2. In a pendant adapted to depend from the overarm of a milling machine, the combination of a lubricant chamber formed in the pendant adjacent the overarm side thereof, an arbor bearing portion formedin the pendantbeneath said chamber,- and'a channel leading: from the reservoir to said bearing portion for efiecting lubrication thereof, said channel intersecting the reservoir adjacent the floor thereof whereby lubricant.

from flowing when the pendant is in an inverted position.

3. In a. pendant for journ'alihg th'e'o'utboard end of the arbor of a milling machine and supporting the same in fixed spaced relation from'anover arm, the combination with a bearing forthe arbor formed in the pendant, of means self-contained in the pendant for lubricating said bearing comprising alubricant reservoir formed in the pendant between the over-arm and the bearing, a bore extending from the reservoir to the bearing, a tube extending through the chamber having one end inserted in the bore and the other end extending through the wall of the reservoir to atmosphere, and means in the tube for conducting lubricant from the closed reservoir to said bearing. under atmospheric pressure.

4. In a pendant suspendable from the'overarm of a milling machine and having spaced structural walls for supporting a bearing in which a will flow to the bearing portion when the pendant g is in a depending position and will be prevented H cutter arbor is journaled, the combination of a lubricant reservoir formed between said walls, a channel extending from said reservoir to the bearing; a tubular member mounted in the channel and extending through the opposite wall of said reservoirjlateral apertures in said member communicating with said reservoir, and a wick inserted in the member opposite to said aperttures" to control the flow of lubricant from the reservoir toithe bearing,

1 EDGAR D.,VANCIL. 

